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Commitments and Contingencies (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 08, 2014 | Apr. 30, 2010 instance_of_noncompliance | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |
Deferred rent |  |  | $ 3,000,000 us-gaap_DeferredRentCredit | $ 3,400,000 us-gaap_DeferredRentCredit |
Total rent expense |  |  | 14,600,000 us-gaap_OperatingLeasesRentExpenseNet | 19,300,000 us-gaap_OperatingLeasesRentExpenseNet | 17,700,000 us-gaap_OperatingLeasesRentExpenseNet
Exposure to earthquake loss |  |  | 62,500,000 us-gaap_LossFromCatastrophes |  |
Number of instances of non-compliance issued from regulatory body |  | 35 mcy_NumberOfInstancesOfNonComplianceIssuedFromRegulatoryBody |  |  |
Settlement of fine and penalty levied by California DOI | $ 27,593,550 us-gaap_LitigationSettlementAmount |  |  |  |

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- Definition Number of Instances of Non-Compliance Issued from Regulatory Body + References No definition available. + Details
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- Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
Name: | us-gaap_DeferredRentCredit
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Balance Type: | credit
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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Balance Type: | credit
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- Definition The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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